What is Buzzbomb?
1.
A bad-ass car, or Macho-Mobile as in the Dead Kennedys' song "Buzzbomb".
Jeff: Did you see that '66 Shelby Mustang GT 350 that just went by?
Bill: Yeah, it was a total buzzbomb.
See
2.
An overly hyped movie that sucks balls.
(Note that a movie can be a box office success, but still be an absolute piece of crap storywise.)
Star Wars (episodes I, II, and III), and The Blair Witch Project are examples of buzzbomb movies.